Would 3.0 kg of water warmed from 10.0°C to 80.0°C an endothermic or exothermic reaction?

Question

Would 3.0 kg of water warmed from 10.0°C to 80.0°C an endothermic or exothermic reaction?

Answer 1

Since the temperature is going up from 10º to 80º, heat must be added to the system. Since heat is added, this make it an ENDOTHERMIC process (not reaction). Now, if you are referring to a reaction taking place in water (aqueous), then it would be an exothermic reaction. For example, A(aq) + B(aq) ==> C and the reaction solution (water) warmed up from 10 to 80 degrees, this would be an exothermic reaction. But just heating water from 10 to 80 degrees (no chemical reaction) would be an endothermic process.